<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<!--行内样式：
			width：宽
			heigh:高
			background-color：背景颜色
			border:线条颜色 线条的宽度 线条的样式；
			border-radius
		-->
		
		<div style=" width:0px;height:0px;border:100px solid red;border-top:transparent 100px solid;border-left:transparent 100px solid;border-right: transparent 100px solid;">
			
		</div>
		
		
		<div style="width: 100px; height: 20px; border: 1px solid green;border-radius:50px 10px">
			
		</div>
		
		
		
		
		<div style="width: 100px; height: 100px; border: 1px solid green;border-radius:50px">
			
		</div>
		
		<div style="width: 100px; height: 100px; border: 1px solid green;border-radius:50px 40px">
			
		</div>
		
		<div style="width: 100px; height: 100px; border: 1px solid green;border-radius:50px 40px 30px">
			
		</div>
		
		<div style="width: 100px; height: 100px; border: 1px solid green;border-radius:50px 40px 30px 20px">
			
		</div>
		
		
		
		
		<div style=" width:200px;height: 200px; background-color: red;">
			
			<div style="width: 100px;height: 100px; background-color:yellowgreen;"></div>
			
		</div>
		
		
		<div style=" width:200px;height: 200px;border:red 2px solid;">
			
			<div style="width: 100px;height: 100px; border:darkcyan 10px dotted;"></div>
			
		</div>
	</body>
</html>
